PC "not responding" when I use the Subsurf and Bevel modifier at the same time
Blender can become unresponsive if 


the combination of modifiers creates a large amount of Faces


Make sure the subsurf is turned to a low level when applying the bevel modifier!
Also keep in mind that changing the order of modifiers affects the order in which blender processes them.


placing the subsurf as the second modifier includes the bevel in the calculation


If neither of the above causes the problem, try a different version of blender or a new file.